Datasheet
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
VIN, RON to GND -0.3V to 43.5V
EN, FB, SS to GND -0.3V to 7V
Junction Temperature 150°C
Storage Temperature Range -65°C to 150°C
ESD Susceptibility(Note 2) ± 2 kV
For soldering specifications:
see product folder at www.national.com and
www.national.com/ms/MS/MS-SOLDERING.pdf
Operating Ratings (Note 1)
V
IN
6V to 42V
EN 0V to 6.5V
Operation Junction Temperature −40°C to 125°C
Electrical Characteristics Limits in standard type are for T
J
= 25°C only; limits in boldface type apply over the
junction temperature (T
J
) range of -40°C to +125°C. Minimum and Maximum limits are guaranteed through test, design or statistical
correlation. Typical values represent the most likely parametric norm at T
J
= 25°C, and are provided for reference purposes only.
Unless otherwise stated the following conditions apply: V
IN
= 24V, Vout = 3.3V
Symbol Parameter Conditions
Min
(Note 3)
Typ
(Note 4)
Max
(Note 3)
Units
SYSTEM PARAMETERS
Enable Control
V
EN
EN threshold trip point V
EN
rising 1.10 1.18 1.25 V
V
EN-HYS
EN threshold hysteresis V
EN
falling 90 mV
Soft-Start
I
SS
SS source current V
SS
= 0V 5 8 11 µA
I
SS-DIS
SS discharge current -200 µA
Current Limit
I
CL
Current limit threshold d.c. average 2.3 2.6 3.65 A
ON/OFF Timer
t
ON-MIN
ON timer minimum pulse width 150 ns
t
OFF
OFF timer pulse width 260 ns
Regulation and Over-Voltage Comparator
V
FB
In-regulation feedback voltage V
SS
>+ 0.8V
T
J
= -40°C to 125°C
I
O
= 2A
0.775 0.795 0.815 V
V
SS
>+ 0.8V
T
J
= 25°C
I
O
= 10 mA
0.786 0.802 0.818 V
V
FB-OV
Feedback over-voltage
protection threshold
0.92 V
I
FB
Feedback input bias current 5 nA
I
Q
Non Switching Input Current V
FB
= 0.86V 1 mA
I
SD
Shut Down Quiescent Current V
EN
= 0V 25
μA
Thermal Characteristics
T
SD
Thermal Shutdown Rising 165 °C
T
SD-HYST
Thermal shutdown hysteresis Falling 15 °C
θ
JA
Junction to Ambient 4 layer JEDEC Printed Circuit Board,
100 vias, No air flow
19.3 °C/W
2 layer JEDEC Printed Circuit Board, No
air flow
21.5 °C/W
θ
JC
Junction to Case No air flow 1.9 °C/W
PERFORMANCE PARAMETERS
ΔV
O
Output Voltage Ripple 8 mV
PP
ΔV
O
/ΔV
IN
Line Regulation V
IN
= 12V to 42V, I
O
= 2A .01 %
ΔV
O
/I
OUT
Load Regulation V
IN
= 24V 1.5 mV/A
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